Wow, been off this thread for a while and don't know where to pick up. Quite a lot of flaming here. However, some scientifically inaccurate statements have been made.
I will say this. I think, given the proper conditions for a sufficient length of time, life, as we understand life to be, will almost certainly arise from non-life. I agree with whoever said "99.9%." I think so too. Eventually scientific inquiry will tell me if I am correct.
I don't think a direct invervention by a supernatural being or other intelligent agent is necessary to bring about life. Non-life and life aren't all that different. The difference is one of degree, not kind. It is we humans that classify according to kind. This is just another version of the "species problem."
All through natural history we see steadily emerging complexity from simplicity. First there was a chaotic mass of matter and energy emerging from the "Big Bang". Then the disorganized matter became organized into atoms and molecules. Then, heavier elements emerged. Then cosmological structure, with galaxies, stars, and planets emerged. On a planet like ours, with the right conditions, matter became even more complex, becoming what we call "life." Life itself became more complex, and cells self arranged into multicellular organisms. Those became more complex over time, and eventually matter arranged itself into what we recognize as homo sapiens, who can think, ask, wonder, and recognize and worship the source of all things.
The process is speeding up, if we examine the history of the universe. It is accelerating. I think the process will continue, and things we can scarcely comprehend will come into being in the span of time. The Universe will become conscious. We are a link in a long chain, coming from God, and leading back to God. This is the Omega Point. The genius of God lies not in his having to act constantly to realize his will. It lies in creating a universe in an infinite instant that would unfold over time into what he willed.
And then we will say "let there be light."
Just my humble opinion.